According to the <a href="http://www.aamc.org/students/applying/policies/recommendations.htm" target="_blank">AAMC rules</a>, schools are not supposed to offer any acceptances after someone starts school or an orientation program. However, the rules are not always followed.
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After an applicant has enrolled in a U.S. school of medicine or begun a brief orientation program contiguous to enrollment, no further acceptances should be offered to that individual. Once enrolled in a school, students have an obligation to withdraw their applications promptly from all other schools. Enrollment is defined as being officially registered as a member of the first-year entering class at a school.
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